The galaxy Messier 33 is a beautiful spiral star-city that is relatively close and therefore huge from our viewpoint, but it has such low surface brightness that it can be hard to find by telescope. M33 is also unusual for other reasons, including that a New General Catalog object resides within it.
A quick explanation of the Messier (M) and New General Catalog (NGC) numbers:
*** Charles Messier, 1730-1810, who served as chief astronomer at the Marine Observatory, Paris, searched diligently